Commercial & Trade Relations Between Tsarist Russia, the Soviet Union & the U.S., 1910-1963 This link opens in a new windowThis collection of U.S. State Department Central Classified Files relates to commercial and trade relations beginning in the Tsarist Russia period and extending through Khrushchev period in Soviet history. It contains a wide range of materials from U.S. diplomats including materials on treaties, general conditions affecting trade, imports and exports, laws and regulations, customs administration, tariffs, and ports of entry activities. Content includes more than 37,000 images and ranges from 1910-1963.